.splitting-image {
    background-size: 0% 0%;
    position: relative;
    overflow: hidden;
}

.splitting-image img {
    display: block;
}

@supports (--row-size: calc( 100% / 2 )) {
    .splitting-image {
        background-size: cover;
        visibility: hidden;
        --row-size: calc(100% / var(--row-total));
        --col-size: calc(100% / var(--col-total));
    }

    .split-cell {
        background: inherit;
        position: absolute;
        overflow: hidden;
        top: calc(var(--row-size) * var(--row-index));
        left: calc(var(--col-size) * var(--col-index));
        width: calc(0.5px + var(--col-size));
        height: calc(0.5px + var(--row-size));
    }

    .split-cell__inner {
        position: absolute;
        visibility: visible;
        background: inherit;
        width: calc(100% * var(--col-total));
        height: calc(100% * var(--row-total));
        transform: translate(
                calc(-1 * var(--col-size) * var(--col-index)),
                calc(-1 * var(--row-size) * var(--row-index))
        );
    }
}
.tiler {
    position: relative;
    display: inline-block;
    cursor: pointer;
    visibility: hidden;
    width: 33.3%;
    margin: auto;
}

.tiler img {
    display: block;
    margin: auto;
    max-width: 100%;
    visibility: visible;
}

.tiler-overlay {
    background-position: center center;
    margin: auto;
    position: fixed;
    top: 1em;
    bottom: 1em;
    left: 1em;
    right: 1em;
    max-width: 1000px;
    max-height: 600px;
    -webkit-perspective: 30px;
    perspective: 30px;
}

.tiler-overlay .split-cell {
    pointer-events: none;
    opacity: 0;
    -webkit-transform: translateZ(-15px);
    transform: translateZ(-15px);
    -webkit-transform-style: preserve-3d;
    transform-style: preserve-3d;
    transition-property: opacity, -webkit-transform;
    transition-property: transform, opacity;
    transition-property: transform, opacity, -webkit-transform;
    transition-duration: 0.5s, 0.4s;
    transition-timing-function: cubic-bezier(0.65, 0.01, 0.15, 1.33);
    /* The center character index */
    --center-x: calc((var(--col-total) - 1) / 2);
    --center-y: calc((var(--row-total) - 1) / 2);
    /* Offset from center, positive & negative */
    --offset-x: calc(var(--col-index) - var(--center-x));
    --offset-y: calc(var(--row-index) - var(--center-y));
    /* Absolute distance from center, only positive */
    --distance-x: calc(
            (var(--offset-x) * var(--offset-x)) / var(--center-x)
    );
    /* Absolute distance from center, only positive */
    --distance-y: calc(
            (var(--offset-y) * var(--offset-y)) / var(--center-y)
    );
    transition-delay: calc( 0.1s * var(--distance-y) + 0.1s * var(--distance-x) );
}

.tiler-overlay {
    z-index: 2;
}

.tiler:hover .split-cell {
    -webkit-transform: scale(1);
    transform: scale(1);
    opacity: 1;
}

html {
    height: 100%;
    display: flex;
    background: #323643;
}

body {
    display: flex;
    flex-wrap: wrap;
    max-width: 800px;
    padding: 2em;
    margin: auto;
}
